Adjustable electromagnetic drill mount

ABSTRACT

An adjustable electromagnetic drill mount provided with a base that magnetically grips the work surface. The drill or similar tool is mounted for rotatable movement up to 700* and also limited lateral movement with respect to its supporting magnetic base to locate the drill bit over the desired work point. The drill mount is provided with a clamping arrangement whereby the mount is firmly clamped to the magnetic base after the drill bit or other tool is located precisely over the work surface.

United States Patent 9] Buck [111 3,796,506 51 Mar. 12, 1974 ADJUSTABLEELECTROMAGNETIC DRILL MOUNT [76] Inventor: Eugene W. Buck, 110 LansberryCt., Los Gatos, Calif.

22 Filed: Dec. 16, 1971 21 Appl. No.: 208,579

3,159,061 12/1964 Walker et a1. 408/76 3,254,547 6/1966 Engelsted et a1.593,373 11/1897 Estell 287/58 CT Primary Examiner-Andrew R. JuhaszAssistant Examiner-l-lorace M. Culver Attorney, Agent, or FirmAllen &Chromy v 57] ABSTRACT An adjustable electromagnetic drill mount providedwith a base that magnetically grips the work surface. The drill orsimilar tool is mounted for rotatable movement up to 700 and alsolimited lateral movement with respect to its supporting; magnetic baseto locate the drill bit over the desired work point. The drill mount isprovided with a clamping arrangement whereby the mount is firmly clampedto the magnetic base after the drill bit or other tool is locatedprecisely over the work surface.

6 Claims, 16 Drawing Figures PAIENTEBIAR 12 m4 3; 796; 506

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INV TOR. EUGENE W. UCK

PAIENIEDIARIZW 3.796506 SHEEI 3 0F 3 III HI FIG. l2

INVENTOR. EUGENE w. BUCK ATTORNEYS DRILL MOUNT DESCRIPTION OF THEINVENTION This invention relates to portable electromagnetic drillmounts in general. More particularly this invention relates to anadjustable drill mount in which provision is made for rotating the drillmount through a relatively large angle and also lateral movement thereofwith respect to the magnetic base of the mount.

An object of this invention is to provide an improved electromagneticdrill mount in which the tool may be adjusted with respect to thesupporting base through a large angle.

Another object of this invention is to provide an improvedelectromagnetic drill mount in which the mount is rotatable through anangle in excess of 360 and limited lateral movement thereby providing awide latitude of adjustment of the drill bit with respect to the worksurface after the magnetic base grips the work surface.

-Still another object of this invention is to provide an electromagneticdrill mount with an improved clamping arrangement for clamping themountto the magnetic base whereby the mount may be-firmly and positivelyclamped to the magnetic base after the drill bit is located over thedesired point of the work surface.

Other and further objects of this invention will be apparent to thoseskilled in the art to which it relates from the following specification,claims and drawing.

, This invention is an improvement over my prior U.S. Pat. No.3,044,324. In accordance with this invention there is provided anadjustable electromagnetic drill mount with an improved clampingarrangement between the mount and the magnetic base, such that the mountcarrying the drill bit may be moved through a complete circle withrespectto the magnetic base after said base is energized andmagnetically grips the work surface. This versatile adjustment of themount with respect to the work surface is made possible by providing aplate between the mount and the magnetic base and said plate is attachedto the mount. A curved groove extending over an angle of slightly lessthan 360 is provided to the bottom surface of this plate. Another grooveof predetermined dimensions is provided in the top surface of themagnetic base and this groove is I aligned with the groove provided inthe underside of the aforesaid plate. A ball is positioned in saidgrooves to limit the rotary motion between the mount and the magneticbase. The clamping arrangement includes a pin threaded into the top ofthe magnetic base and extending through the above mentioned plate intothe bottom of the drill mount to clamp the bottom surface of theaforesaid plate against the'top surface of the magnetic base when theclamping mechanism is tightened by the operator after the point of thedrill bit is located over the desired point of the work surface. Thisdevice is also provided with a rear legcam lock for quick and automaticadjustment.

Further details and features of this invention will be set forth in thefollowing specification, claims and drawing in which, briefly:

FIG. 1 is a view in side elevation of an electromagnetic drill mountembodying this invention;

FIG. 2 is a sectional view taken along the line 2-2 of FIG. I; i

FIG. 3 is a sectional view taken along the line 3-3 of FIG. 1;

FIG. 4 is a sectional view taken along the line 4-4 of FIG. 2; i i IFIG. 5 is a sectional view taken'along the line 5-5 of FIG. 3;

FIG. 6 is a sectional view of the lower part of the drill mount and themagnetic base showing the clamping arrangement therebetween;

FIG. 7 is a horizontal view showing the top of the clamping arrangementshown in FIG. 6;

FIG. 8 is an exploded view of the clamping mechanism actuating device;

FIG. 9 is a plan view of the clamping washer employed in the clampingmechanism;

FIG. 10 is a vertical view of the stabilizing leg attach-' ing meansemployed in this drill mount;

FIG. 11 is a view of thebolt with eccentric portion employed forclamping the stabilizing leg shown in FIG. 10;

FIG. 12 is a sectional view taken along the lin 1212 of FIG. 11; and IFIGS. 13, 14, 15 and 16 are views used to facilitate the description ofthe operation of this invention.

The adjustable electromagnetic drill mount as shown in FIG. 1 isprovided with an electromagnetic base 10 which is attached to the bottomof a frame structure that includes an upright housing or post structure1 1 on which a portable drill 12 which may be either electrically or airdriven, is mounted. in a conventional manner on a slide 13 carried insuitable guides 14. The slide 13 is adjustable vertically with the drilll2 thereon by means of the operating handle 15 in a conventional manner,for example, as disclosed in my prior US. Pat. No. 3,044,324 issued July17. 1962. The post 1 l is providedwitha base 16 and the plate 17 isattached thereto by the bolts 18. The bottom surface of the plate 17 isprovided with a groove or cavity 19 which is sub stantially concentricwith the center of the plate and extends through an angle of slightlyless than 360 as shown in FIG. 2. The upper surface of the base 10 isprovided with a short circular cavity 20 as shown in FIG. 3 which isaligned with cavity 19 of the plate 17 and the steel ball 25 is locatedin these cavities. The

base 10 is also provided with a threaded central hole 21 which receivesthe bottom threaded portion of the pin 22 as shown in FIG. 6. A channel24 in the top of the base 10 extends radially from the central hole 21into the coil cavity of the magnetic base 10 and theelectrical'connections 26 which are provided to the coil 27 are locatedin this channel. Channel 24 communicates with a hole in the wall of thehollow pin 22 and the electrical connections 26 are inserted into thehollow pin through this hole. Connections 26 are connected to arectifier (not shown) which is positioned in the post 1 l and rectifiesthe alternating current supplied to this device through the suitableelectrical connection that is adapted to be plugged into conventionalelectrical outlets. Thus the coil 27 is provided with rectified electriccurrent through the conductors 26. Coil 27 is wound on a suitable bobbin28 and it is retained in the coil cavity,

in the base 10 by the large washer 29 which is positioned in the bottomof the cavity and which is retained in place by the snap ring 29.

The plate 17 forms the bottom of the post 11 and it is attached to theflange 16 of the post 11 by the bolts 18. The plate 17 is clamped to themagnetic base 10 by the clamping mechanism which is adjusted by thehandle 30 that is attached to the rod 31. Rod 31 extends out of the sideof the post 11 through a suitable aperture provided in this post and theinner end of this rod is provided with threads which engagecorresponding threads provided in member 33. Member 33 isattached bywelding or the like to the yoke 34. However, the member 33 and yoke 34may be made as a unit by precision steel casting. Two rollers 35 and 36are positioned in recesses in the yoke 34 and they engage race ways 37aon opposite sides of the member 37 so that these rollers are positionedon opposite sides of the pin 22. Member 37 is of circular configurationand it is positioned around the pin 22 so that the rollers 35 and 36 areconfined between the opposite walls of the race ways 37a and therespective recesses in the yoke 34. The bottom surface of member 37engages the top of the plate 17. The upper part of the pin 22 isthreaded and receives the nut 38 which engages the upper surface of thewasher 39. Washer 39 is positioned over the yoke 34, and bottom surfacesof this washer are engaged by the rollers 35 and 36 as shown in thedrawing. When the operator desires to tighten the post to the magnetbase he turns the handle 30 so that the inner end of rod 31 pressesroller 36 inward and at the same time yoke 34 urges roller 35 inwardthereby exerting pressure against washer 39 to clamp the bottom 17 ofthe post against the top of the magnet base. Loosening of the rod 31 ofcourse removes the pressure of the rollers 35 and 36 on washer 39 andpermits rotative motion of the post with respect to the magnet base.

This device is also provided with a stabilizing leg 42 that is attachedto the bracket 43 which is attached to the rear of the post 11 bysuitable bolts as shown in FIG. 10. Leg 42 is held in a predeterminedposition in a hole formed in the bracket 43 and an eccentric device 44is provided for this purpose. The eccentric device 44 is provided withbearing surfaces 440 and 44b which are journaled in suitable holesformed in the bracket, and the eccentric 440 is positioned between thesebearing surfaces. The device is provided with a nut 45 threaded theretofor retaining it in position on the bracket and the other end of thedevice is provided with an operating handle 46. Thus, when the leg 42 ispositioned in the bracket 43 the handle 46 is rotated so that theeccentric surface 440 is brought to bear against the leg 42 and hold itfixed in its adjusted position.

FIGS. 13, 14, 15 and 16 are schematic drawings illustrating fourdifferent positions of the bottom of post 11 and the groove 19 withrespect to the top of the magnetic base and groove 20. Groove 20 limitsthe movement of ball 25. When the post is rotated clockwise as indicatedby the arrows in FIGS. 14 and one end of groove 19 will engage the ball25 as shown in FIG. 15 and further clockwise motion will move the ball25 to the right hand end of groove as shown in FIG. 16 at which pointclockwise rotation of the post is arrested. This procedure may bereversed and the post rotated counterclockwise. After rotation throughan angle of about 330 the ball is engaged by an end of groove 19 andafter further rotation of the post through an angle of about 70,rotation is arrested since the ball is moved against the left hand endof groove 20. If each of the grooves 19 and 20 is made slightly lessthan 360 then this arrangement permits rotation of the drill postthrough an angle approaching 700 depending upon the lengths of thegrooves 19 and 20, so that the operator is permitted a wide latitude ofrotative adjustments of the drill bit with respect to the work surface.Also, the plate 17 attached to the bottom of the post is provided withan elongated hole for receiving the pin 22 so that limited lateralmovement of the post is permitted throughout the large angle'ofadjustment. As a result the operator can save valuable time in usingthis device in drilling a plurality of holes that are in a given spacearound the'magnet base without de-energizing and moving the base.

After the drill bit is positioned over the desired point of the worksurface the clamping mechanism is tightened by tightening the handle 30and applying pressure to roller 36 thereby causing this roller to moveup one of the inclined surfaces 37a against washer 39. At the same timeyoke 34 causes roller 35 to move up the other inclined surface 370against washer 39. As a result, the bottom surface of member 17 isclamped against the top surface of the magnet base 10 and the post 11 isimmobilized on this base. Of course, when it is desired to adjust thepost 11 with respect to the base 10 the clamping mechanism must beloosened by rotating handle 30 in the opposite direction.

While I have shown and described a preferred form of the invention itwill be apparent that the invention is capable of variation andmodification from the form shown so that the scope thereof should belimited only by the scope of the claims appended hereto.

What I claim is:

1. In an adjustable electromagnetic drill mount, the combination of amagnetic base having an electrically energized coil positioned in acavity therein for magnetizing said base, a post having means attachinga portable drill thereto, adjustable means attaching said post to saidbase, said last mentioned means including means releasably clamping saidpost to said base permitting rotation of said post with respect to saidbase when released, and rotation limiting means between the bottom ofsaid post and the top of said magnetic base, said rotation limitingmeans comprising a loose member movable in grooves formed in the bottomsurface of said post and in the top surface of said magnetic baselimiting rotational movement of said post with respect to said base whenends of said grooves engage opposite sides of said member.

2. In an adjustable electromagnetic drill mount, the combination as setforth in claim 1, further characterized in that said adjustable meansattaching said post to said base comprises a pin attached to said baseextending upward into said post through the bottom of said post, a pairof washers surrounding said pin and said clamping means comprising meanspositioned between said washers forcing said washers apart and tightlypressing the bottom of the base plate of said post against said base.

3. In an adjustable electromagnetic drill mount, the combination as setforth in claim 2, further characterized in that one of said washers isprovided with oppositely inclined surfaces and said clamping meansincludes rollers engaging said inclined surfaces and pressing saidwashers apart.

4. In an adjustable electromagnetic drill mount, the combination as setforth in claim 3, further characterized in that said clamping meansincludes a yoke confining said rollers between said washers and manuallyoperable means attached to said yoke engaging one of said rollers.

5. In an adjustable electromagnetic drill mount, the

combination as set forth in claim 1, further characterof said post tosaid base, said last mentioned means including means releasably clampingsaid post to said base permitting rotation of said post with respect tosaid base when released, and rotation limiting means between the bottomof said post and the top of said magnetic base, said rotation limitingmeans comprising a floating member extending into and movable inopposing arcuate grooves formed in. the bottom of said post and in thetop of said base.

1. In an adjustable electromagnetic drill mount, the combination of amagnetic base having an electrically energized coil positioned in acavity therein for magnetizing said base, a post having means attachinga portable drill thereto, adjustable means attaching said post to saidbase, said last mentioned means including means releasably clamping saidpost to said base permitting rotation of said post with respect to saidbase when released, and rotation limiting means between the bottom ofsaid post and the top of said magnetic base, said rotation limitingmeans comprising a loose member movable in grooves formed in the bottomsurface of said post and in the top surface of said magnetic baselimiting rotational movement of said post with respect to said base whenends of said grooves engage opposite sides of said member.
 2. In anadjustable electromagnetic drill mount, the combination as set forth inclaim 1, further characterized in that said adjustable means attachingsaid post to said base comprises a pin attached to said base extendingupward into said post through the bottom of said post, a pair of washerssurrounding said pin and said clamping means comprising means positionedbetween said washers forcing said washers apart and tightly pressing thebottom of the base plate of said post against said base.
 3. In anadjustable electromagnetic drill mount, the combination as set forth inclaim 2, further characterized in that one of said washers is providedwith oppositely inclined surfaces and said clamping means includesrollers engaging said inclined surfaces and pressing said washers apart.4. In an adjustable electromagnetic drill mount, the combination as setforth in claim 3, further characterized in that said clamping meansincludes a yoke confining said rollers between said washers and manuallyoperable means attached to said yoke engaging one of said rollers.
 5. Inan adjustable electromagnetic drill mount, the combination as set forthin claim 1, further characterized in that said loose member comprises asteel ball or free floating member and said rotational movement of saidpost with respect to said base is equal substantially to the combinedlengths of said grooves.
 6. In an adjustable electromagnetic drillmount, the combination of a magnetic base having an electricallyenergized coil positioned in a cavity therein for magnetizing said base,a post having means attaching a portable drill thereto, adjustable meansattaching the bottom of said post to said base, said last mentionedmeans including means releasably clamping said post to said basepermitting rotation of said post with respect to said base whenreleased, and rotation limiting means between the bottom of said postand the top of said magnetic base, said rotation limiting meanscomprising a floating member extending into and movable in opposingarcuate grooves formed in the bottom of said post and in the top of saidbase.